Four-Domain Divided Inclined Vertical Alignment by Irradiation of Unpolarized Ultra Violet Light

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Abstract
A four-domain divided vertically-aligned liquid crystal panel (LCP) has been realized by irradiating unpolarized UV light on a vertical alignment layer through an optical mask. The liquid crystal (LC) with a negative dielectric anisotropy is filled. As the alignment has no disclination for the black state, the transmittance in the black state is the same as that with mono-domain vertically aligned LCPs, realizing a high contrast ratio of over 300. With a negative birefringence film, the fabricated LCP exhibits a wide viewing range. It has a contrast ratio of over 10 at any inclination angle of within 60° at any viewing azimuth and has almost no gray scale inversion.